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10. Comparison of Two 6-DOF Parallel Mechanisms Based on Kinematic Models

Author

Wu, Hongye, Liu, Haitao, Yue, Wei, Han, Jiale, Ma, Wei, Cheng, Hongfei, Zhou, Junfu, Ceccarelli, Marco, Series Editor, Agrawal, Sunil K., Advisory Editor, Corves, Burkhard, Advisory Editor, Glazunov, Victor, Advisory Editor, Hernández, Alfonso, Advisory Editor, Huang, Tian, Advisory Editor, Jauregui Correa, Juan Carlos, Advisory Editor, Takeda, Yukio, Advisory Editor, and Okada, Masafumi, editor

Published
2023
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25. Synergistic Effect of Ni/Ni(OH)2 Core‐Shell Catalyst Boosts Tandem Nitrate Reduction for Ampere‐Level Ammonia Production

Author

Shi, Xinyue, primary, Xie, Minghui, additional, Yang, Kaiwen, additional, Niu, Yutao, additional, Ma, Haibin, additional, Zhu, Yiming, additional, Li, Jiayi, additional, Pan, Tingting, additional, Zhou, Xiaoyan, additional, Cui, Yujie, additional, Li, Zhao, additional, Yu, Yifu, additional, Yu, Xiaohua, additional, Ma, Jiwei, additional, and CHENG, Hongfei, additional

Published
2024
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33. Synergistic Effect of Ni/Ni(OH)2 Core‐Shell Catalyst Boosts Tandem Nitrate Reduction for Ampere‐Level Ammonia Production.

Author

Shi, Xinyue, Xie, Minghui, Yang, Kaiwen, Niu, Yutao, Ma, Haibin, Zhu, Yiming, Li, Jiayi, Pan, Tingting, Zhou, Xiaoyan, Cui, Yujie, Li, Zhao, Yu, Yifu, Yu, Xiaohua, Ma, Jiwei, and Cheng, Hongfei

Subjects
DENITRIFICATION, HYDROGEN evolution reactions, OXIDATION of methanol, STANDARD hydrogen electrode, CATALYST testing, AMMONIA, DENSITY functional theory
Abstract

Electrocatalytic reduction of nitrate to ammonia provides a green alternate to the Haber–Bosch method, yet it suffers from sluggish kinetics and a low yield rate. The nitrate reduction follows a tandem reaction of nitrate reduction to nitrite and subsequent nitrite hydrogenation to generate ammonia, and the ammonia Faraday efficiency (FE) is limited by the competitive hydrogen evolution reaction. Herein, we design a heterostructure catalyst to remedy the above issues, which consists of Ni nanosphere core and Ni(OH)2 nanosheet shell (Ni/Ni(OH)2). In situ Raman spectroscopy reveals Ni and Ni(OH)2 are interconvertible according to the applied potential, facilitating the cascade nitrate reduction synergistically. Consequently, it attains superior electrocatalytic nitrate reduction performance with an ammonia FE of 98.50 % and a current density of 0.934 A cm−2 at −0.476 V versus reversible hydrogen electrode, and exhibits an average ammonia yield rate of 84.74 mg h−1 cm−2 during the 102‐hour stability test, which is highly superior to the reported catalysts tested under similar conditions. Density functional theory calculations corroborate the synergistic effect of Ni and Ni(OH)2 in the tandem reaction of nitrate reduction. Moreover, the Ni/Ni(OH)2 catalyst also possesses good capability for methanol oxidation and thus is used to establish a system coupling with nitrate reduction. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Investigation of methane adsorption in kaolinite–methanol intercalation complex interlayer by Monte Carlo simulations.

Author

Zhu, Lei, Song, Wei, Liu, Chengyong, Gu, Wenzhe, Zhao, Mengye, Liu, Zhicheng, Wang, Yang, Hao, Riwa, and Cheng, Hongfei

Abstract

The methane adsorption at room temperature in the interlayer of the kaolinite–methanol complex (Kln–Me) with different methanol content is investigated with grand canonical Monte Carlo (GCMC) simulation. The mechanism and structure of methanol intercalated kaolinite (Kln) is proposed, and the effect of methanol on methane adsorption by Kln–Me is discussed. The results indicate that the methanol adsorption in the Kln interlayer is mostly physical with non-bonded energy. The interlayer spacing (d) of Kln–Me optimized by the DREIDING force field is in good agreement with the experimental data measured with X-ray diffraction. The configuration, adsorption properties, and adsorption isotherms are obtained for eight Kln–Me systems with different number (2–20) of methanol molecules in interlayer space. By comparing methane adsorption in the Kln–Me interlayer with different number of methanol molecules, we discover the complex interplay of factors influencing methane adsorption in the Kln–Me interlayer, especially the number of methanol molecules and free volume. It is found that the adsorption capacity of Kln can be enhanced by inserting methanol molecules into its interlayer. This analysis also underscores the GCMC simulation as a viable tool to calculate kaolinite/organic intercalation composites for potential applications. [ABSTRACT FROM AUTHOR]

Published
2024
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